I bought a 700 M-Edge executive cover from Amazon.com for my 505. They were $14.99 vs. $24.99 for the 505 cover. It's working fine for me. The straps go over the corners at a slightly different angle and the bottom corners seem a little bigger but I've been using it for over a month and shook it good when I first put it in the cover and it seems plenty secure. You would probably be fine with either.
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